<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <input type="text" v-model="n1">
    <input type="text" v-model="n2">
    <input type="button" value="加" @click="f(1)">
    <input type="button" value="减" @click="f(2)">
    <input type="button" value="乘" @click="f(3)">
    <input type="button" value="除" @click="f(4)">
    <h1>结果:{{result}}</h1>
</div>
<script src="js/Vue.js"></script>
<script>
    Vue.createApp({
        data() {
            return {
                n1:"",n2:"",result:""
            }
        },
        methods: {
            f(x) {
                /*通过this获取当前vue实例中data里面的变量*/
                //console.log(this.n1+"----"+this.n2);
                if (isNaN(this.n1)||isNaN(this.n2)){
                    this.result="输入错误";
                    return;
                }
                switch (x){
                    case 1:
                        this.result=this.n1*1+this.n2*1;
                        break;
                    case 2:
                        this.result=this.n1-this.n2;
                        break;
                    case 3:
                        this.result=this.n1*this.n2;
                        break;
                    case 4:
                        this.result=this.n1/this.n2;
                        break;
                }
            }
        },
    }).mount("body>div");
</script>
</body>
</html>